--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/mac/pelican/pelican.c	Sun May 08 06:36:47 2005 +0000
@@ -0,0 +1,149 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+ *
+ * LibTomCrypt is a library that provides various cryptographic
+ * algorithms in a highly modular and flexible manner.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ *
+ * Tom St Denis, [email protected], http://libtomcrypt.org
+ */
+#include "tomcrypt.h"
+
+/** 
+   @file pelican.c
+   Pelican MAC, initialize state, by Tom St Denis 
+*/
+
+#ifdef PELICAN
+
+#define ENCRYPT_ONLY
+#include "../../ciphers/aes/aes_tab.c"
+
+
+/**
+   Initialize a Pelican state
+   @param pelmac    The Pelican state to initialize
+   @param key       The secret key 
+   @param keylen    The length of the secret key (octets)
+   @return CRYPT_OK if successful
+*/
+int pelican_init(pelican_state *pelmac, const unsigned char *key, unsigned long keylen)
+{
+    int err;
+    
+    LTC_ARGCHK(pelmac != NULL);
+    LTC_ARGCHK(key    != NULL);
+
+#ifdef LTC_FAST
+    if (16 % sizeof(LTC_FAST_TYPE)) {
+        return CRYPT_INVALID_ARG;
+    }
+#endif
+
+    if ((err = aes_setup(key, keylen, 0, &pelmac->K)) != CRYPT_OK) {
+       return err;
+    }
+
+    zeromem(pelmac->state, 16);
+    aes_ecb_encrypt(pelmac->state, pelmac->state, &pelmac->K);
+    pelmac->buflen = 0;
+
+    return CRYPT_OK;    
+}
+
+static void four_rounds(pelican_state *pelmac)
+{
+    ulong32 s0, s1, s2, s3, t0, t1, t2, t3;
+    int r;
+
+    LOAD32H(s0, pelmac->state      );
+    LOAD32H(s1, pelmac->state  +  4);
+    LOAD32H(s2, pelmac->state  +  8);
+    LOAD32H(s3, pelmac->state  + 12);
+    for (r = 0; r < 4; r++) {
+        t0 =
+            Te0(byte(s0, 3)) ^
+            Te1(byte(s1, 2)) ^
+            Te2(byte(s2, 1)) ^
+            Te3(byte(s3, 0));
+        t1 =
+            Te0(byte(s1, 3)) ^
+            Te1(byte(s2, 2)) ^
+            Te2(byte(s3, 1)) ^
+            Te3(byte(s0, 0));
+        t2 =
+            Te0(byte(s2, 3)) ^
+            Te1(byte(s3, 2)) ^
+            Te2(byte(s0, 1)) ^
+            Te3(byte(s1, 0));
+        t3 =
+            Te0(byte(s3, 3)) ^
+            Te1(byte(s0, 2)) ^
+            Te2(byte(s1, 1)) ^
+            Te3(byte(s2, 0));
+        s0 = t0; s1 = t1; s2 = t2; s3 = t3;
+    }
+    STORE32H(s0, pelmac->state      );
+    STORE32H(s1, pelmac->state  +  4);
+    STORE32H(s2, pelmac->state  +  8);
+    STORE32H(s3, pelmac->state  + 12);
+}
+
+/** 
+  Process a block of text through Pelican
+  @param pelmac       The Pelican MAC state
+  @param in           The input
+  @param inlen        The length input (octets)
+  @return CRYPT_OK on success
+  */
+int pelican_process(pelican_state *pelmac, const unsigned char *in, unsigned long inlen)
+{
+
+   LTC_ARGCHK(pelmac != NULL);
+   LTC_ARGCHK(in     != NULL);
+#ifdef LTC_FAST
+   if (pelmac->buflen == 0) {
+      while (inlen & ~15) {
+         int x;
+         for (x = 0; x < 16; x += sizeof(LTC_FAST_TYPE)) {
+            *((LTC_FAST_TYPE*)((unsigned char *)pelmac->state + x)) ^= *((LTC_FAST_TYPE*)((unsigned char *)in + x));
+         }
+         four_rounds(pelmac);
+         in    += 16;
+         inlen -= 16;
+      }
+   }
+#endif
+
+   while (inlen--) {
+       pelmac->state[pelmac->buflen++] ^= *in++;
+       if (pelmac->buflen == 16) {
+          four_rounds(pelmac);
+          pelmac->buflen = 0;
+       }
+   }
+   return CRYPT_OK;
+}
+
+/**
+  Terminate Pelican MAC
+  @param pelmac      The Pelican MAC state
+  @param out         [out] The TAG
+  @return CRYPT_OK on sucess
+*/
+int pelican_done(pelican_state *pelmac, unsigned char *out)
+{
+   LTC_ARGCHK(pelmac  != NULL);
+   LTC_ARGCHK(out     != NULL);
+   if  (pelmac->buflen == 16) {
+       four_rounds(pelmac);
+       pelmac->buflen = 0;
+   }
+   pelmac->state[pelmac->buflen++] ^= 0x80;
+   aes_ecb_encrypt(pelmac->state, out, &pelmac->K);
+   aes_done(&pelmac->K);
+   return CRYPT_OK;
+}                        
+
+#endif